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An exceptional experience. I have been building PCs since the very beginning, as I could never find a company to build something... (23rd April 2019 via Trustpilot)
PRIME X399-A AMD SocketTR4 EATX Motherboard
1 in stock

ASUS PRIME X399-A AMD SocketTR4 EATX Motherboard

The ASUS PRIME X399-A is ready for AMD's latest Ryzen socketTR4 Threadripper processors, giving you the perfect foundation for an incredibly fast PC.


  1. Socket SocketTR4 EATX motherboard with AMD X399 chipset
  2. Supports 2nd Gen AMD Ryzen Threadripper CPUs
  3. 8 x DDR4 DIMM sockets (max. 128 GB)
  4. 4x PCIe x16 and 2x PCIe x1
  5. 6x SATA 6Gb/s, 2x M.2, 2x RGB headers
  6. 10x USB 3.1 (one type-c), S/PDIF out, 5x Audio jacks and LAN

ASUS Prime X399-A is the EATX motherboard that's been expertly engineered for professional content creators and power users who work hard by day and play harder by night. This powerful, innovative board puts a friendly face on advanced enthusiast controls, enabling you to maximise performance, cooling and personalisation with ease. So, if you live to create, explore, and to push the boundaries, look no further than the Prime X399-A.

Ready for 2nd Gen AMD Ryzen Threadripper

The Prime X399-A Cooling Kit contains an SOC heatsink and a fan bracket, designed to cool vital motherboard power delivery areas to enhance the overclocking potential of 2nd Gen Threadripper Series Processors.

5-Way Optimisation - One-click overclock and cooling, done!

One click takes care of all that complex tuning. ASUS 5-Way Optimisation makes your PC smart. It dynamically optimises essential aspects of the system, providing overclocking and cooling profiles that are tailored for your rig. An automated tuning utility that optimises overclocking and cooling profiles for your unique system configuration. Fans stay whisper-quiet for everyday computing, and deliver optimal airflow when the system is crunching through CPU or GPU-intensive tasks. All-new stress test that allows users to optimise and overclock for CPU or memory-centric workloads.

Cooler by design

Prime X399-A features the most comprehensive cooling controls ever, configurable via Fan Xpert 4 or the UEFI BIOS. Each header can be set to monitor and react to three thermal sensors, and via Fan Xpert 4 you can even assign a sensor to monitor the temperature of supported ASUS graphics cards, for optimal cooling during GPU or CPU-intensive workloads.

Media-acclaimed UEFI BIOS

The smoothest, slickest mouse-controlled graphical BIOS has been improved to make it even more appealing. Whether you're a PC novice or a seasoned overclocker, the EZ and Advanced Modes help you find your way, quickly and easily.

Make your memory go faster

Prime X399-A is engineered to support quad-channel memory kits rated up to a staggering DDR4 3600MHz, allowing you to get the best performance from the X399 platform. ASUS have worked with all major DDR4 memory vendors to help ensure compatibility, so you're assured the best compatibility.

OC Design – ASUS Pro Clock Technology

A dedicated base-clock generator that extends CPU and memory overclocking margins. This custom solution works in tandem with the TPU to enhance voltage and base-clock overclocking control, providing the flexibility to extract every ounce of performance from Ryzen Threadripper processors.

Speed up with onboard M.2 up to 32Gbps

With x4 PCI Express 3.0/2.0 bandwidth, M.2 supports up to 32Gbps data-transfer speeds. It is the perfect choice for an operating system or application drive, providing fast access to data. Prime X399-A has an ultra-efficient heatsink to reduce M.2 SSD temperatures by up to 20°C — and that means optimal storage performance and improved SSD longevity.

U.2 connector - Join the NVMe revolution

The revolutionary specification that lets your SSDs scream at top speed. Just attach your chosen drive to with plug-and-play ease to experience data-transfer speeds of up to 32Gbps — and free up a PCIe slot for another expansion card.

Ultimate-speed 10Gbps with USB 3.1 Type-A and Type-C onboard

With backward-compatible USB 3.1 Gen 2 Type-A and reversible USB 3.1 Gen 2 Type-C ports, you'll experience ultimate connection flexibility and blazing data-transfer speeds of up to 10Gbps.

Multi-GPU support

With support for both NVIDIA SLI and AMD CrossFireX 2/3-WAY configurations, Prime X399-A motherboard enables multi-GPU setups so you can harness the full power of the latest graphics technologies to drive games at 4K and beyond.

Realtek codec and unique design features for pristine, powerful audio

Prime X399-A utilises a unique audio codec designed in close collaboration with Realtek — the Realtek S1220A. It also features an unprecedented 120dB signal-to-noise ratio for the stereo line-out and a 113dB SNR for the line-in, providing pristine audio quality. Additionally, a new impedance-sensing circuit automatically adjusts gain to ensure the optimal volume range for your headphones.

SpecificationsPRIME X399-A
CPUAMD SocketTR4 for 1st and 2nd Gen AMD Ryzen Threadripper Processors
ChipsetAMD X399
Memory8 x DIMM, Max. 128GB, DDR4 3600-2800(O.C.)/2666/2400/2133 MHz ECC and non-ECC, Un-buffered Memory
Multi-GPU SupportSupports NVIDIA SLI and AMD CrossFireX Technology
Expansion Slots4x PCIe 3.0 x16 (single@x16, dual@x16/x16, triple@x16/x16/x8 mode), 1x PCIe 2.0 x4 (max at x4 mode), 1x PCIe 2.0 x1
M.2 Storage2x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (SATA & PCIE 3.0 x 4 mode)
SATA Ports6x SATA 6Gb/s
RAIDSupports Raid 0, 1, 10
LANIntel I211-AT Gigabit LAN with ASUS Turbo LAN Utility and ASUS LAN Guard
AudioRealtek S1220A 8-Channel High Definition Audio CODEC featuring Crystal Sound 3
USB Ports, X399 chipset8x USB 3.1 Gen 1 (blue), 1x USB 3.1 Gen 2 (mid-board), 4x USB 3.1 Gen 1 (mid-board), 4x USB 2.0 (mid-board)
USB Ports, ASMedia2x USB 3.1 Gen 2 at rear (1x Type-A (teal) and 1x Type-C)
Other Rear Ports1 x LAN (RJ45), Optical S/PDIF out, 5x Audio jacks, 1x USB BIOS Flashback Button
ROG AuraAura Lighting Control, 2x Aura RGB Strip Headers *
AccessoriesUser's manual, ASUS Q-Shield, Vertical M.2 bracket set, 4x SATA 6Gb/s cable, M.2 Screw Package, Supporting DVD, SLI HB BRIDGE (2-WAY-M), Q-Connector
Operating SystemWindows 10 64-bit
Form FactorEATX, 305 x 269 mm
Warranty24 months
EAN barcode4712900828085
  • *Aura lighting effects synchronise with other compatible ASUS ROG devices

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